ASUS ROG board. I have a ROG X58 (Rampage 2 Extreme) from 2008 and I am still using it. 9 years and it has been SOLID. I think ASUS ROG boards are basically the best you can get because high end and LOTS of features but HIGH price !!!

There also other reviews showing barely any (if at all) a performance improvement from a HB SLI Bridge. Compared to a flexible SLI bridge you are paying many times over for a rigid bridge that offers doubtful improvements. That's even more so pronounced since most motherboards usually include flexible SLI bridges.